Reversing regenerative furnace.



L. L. KNOX BEVEESING REGENERATIVE FURNACE. APPLICATION FILED MAY 16 1913.

Patented Jan. 27, 1914.

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L. L. KNOX. REVERSING REGENERATIVE FURNACE APPLICATION FILED MAY 16, 1913 Patented Jan. 27, 1914.

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REVBRSING REGENERATIVE FURNAOE.

APPLICATION FILED MAY 16, 1913.

Patented Jan. 27, 1914.

3 SHEETS-SHEET 3.

tinirnn sTA'rEs PATENT OFFICE.

LUTHER L. KNOX, OF AVALON, PENNSYLVANIA, ASSIGNOR TO KNOX DRESSED & WELDED STEEL COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION.

OF PENNSYLVANIA.

REVERSING REGENERATIVE FURNACE.

Specification of Letters lPatent.

Patented Jan. 27,1914.

Application filed May 16, 1913. Serial No. 768,0241

To all whom at any concern Be it known that I, LUTHER L. KNOX, a citizen of the United States, residing at; Avalon, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Reversing Re.

generative Furnaces, of which the following which- Figure 1 is a vertical section of a portion of the masonry work of one end portion of;

an open hearth furnace, showing my invention applied thereto; Fig.2 is a cross section of the same, on the line II-II of Fig. 1;:

Fig. 3 is a plan view of the cooling box rea preferable form of cooling box; Fig. 7 is a plan view showing another modified form; Fig. 8 is a view partly in front QlBVZItIOnf and partly in vertical section of the cooling box shown in Fig. 7; and Fig. 9 is a section on the line IX-IX of Fig. 8.

M invention has relation to reversing regenerative furnaces, and is designed to provide means of novel and effective char-; acter for cooling and protecting the wall orf arch separating the gas andair ports of,

the furnace.

The nature of my invention will be best understood by reference to the accompanying drawings, showing several different embodiments of my invention, which will now be described.

Referring first to that form of my inven tion shown in Figs. 1 to 5, inclusive, the numeral 2 designates the masonry work of one end portion of an open hearth furnace of the reversing regenerative type. 3 designates one of the gas ports of the furnace; 4 the air port above the gas port; 5 the wall of refractory material separating the two ports; 6 the gas uptake; and 7 one of the air uptakes. These portsare, in general, of well known character and need not be described in detail. The numeral 8 designates a cooling box which ext ads through the refractory wall 5 over the nose portion of the gas port 3. This box is of elongated general rectangular form and extends across the major portion of the total width of the furnace, as shown in Fig. 2. At its central portion immediately over the gas port 3, it is formed with an upward and inwardly offset arched portion 9, having the skew backs 10 which support an arch 11 of refractory material, which forms the immediate roof of this portion of the gas port. To -receive this box, the furnace is provided with a transversely extending opening 12, which r preferably extends entirely through the furnace from side to side, as shown in Fig. 2. The box is preferably formed of sheet metal plates suitably welded at their joints and connected by the stay bolts 13. To facilitate the insertion and removal of the box with a minimum disturbance of the furnace structure, the spaces at each side of the port immediately underneaththe refractory arch 11, may be filled with plastic material after the box has been inserted, as indicated at 10 in Fig. 2. In removing the box, if this material has not already burned away, it can be readily broken off. Any suitable system of connections may be provided for maintaining a water circulation within the box. In the drawir gs, I have shown a water supply pipe 14, extending into the box at each end portion thereof and terminating at its inner end in a transverse pipe 15, formed with a plurality of discharge perforations. These transverse pipes 15 are at either side of the arch portion 9 and preferably are arranged so as todischarge the water directly against the skew backs 10. I also show the box as provided with a second set of water inlet pipes 16, one of which extends into each end of the box with a transverse discharge arm ,17, near the outer end of the box and having its inner end arranged to discharge directly from the end portion of the arch. In order to protect the front edge or nose of the refractory arch 11 from direct contact with the gases, the box is provided with a downwardly extending hollow lip 18, which covers and protects this edge. The box is preferably somewhat inclined down from one end toward the other, as shown in Fig. 2, in order to provide for the ready escape of steam from its upper corner portion. The box is preferably pro vided with an outlet connection 20, at each end, one of these connections communicatinvention. In this form, Ihave shownthe tag directly with the stem S a which is provided by reason of this inclination of the box.

In the modification shown in Fig. 6, the

cooling box 8 is in the same general formas that shown in-Figs. l to 5, except that the arch portion 9 with its skew'backs is omitted, and the box is formed with parallel upper andlower surfaces throughout its length. This willappear by reference to Fig, 6, which may be'taken either as a top or a bottom plan view of this form of the box as having'two of the pipes 21 extending therein from opposite ends and terminating near the center of the box in transverse discharge arms 22. I p

' In Figs. 7, 8 and 9, I have shown another modification in which the coolingbox is of the same general character as that shown in Figs. 1 to 5, but has its end portions extending downwardly, as shown at 23, at each side of the gas port so' as to form water- 28, which discharge adjacent to the inner end wall-of the extensions 23..

My invention provides port-cooling means for furnaces of this type which can be readily inserted into and removed from the furnace,'and which provides for keeping a relatively large body of cooling water above and at each side of the upper portion of the gas port. The effect 0 this body of water (which may be circulated as rapidly.

as necessary in order to maintain its temperature at a proper degree) is that that portion of the wall of the gas portlwhich tends to most rapidly cut away by the action of hot gases, is eificiently protected. This protection is afi'orded in such a manner as to. prevent -a too great coolingof the furnac'e gases due to direct contact withwatercooled surfaces. It will be notedthat (with the exception of the form shown iii Fig. 6,

in which a refractory lining may or may not be placedunderneath the cooling box from the gas port) the hot gases do not come into direct contact with the cooling box at any point. Y

I claim: Y

1. The combination with a furnace having gas and air ports and a refractory wall separating said ports, of a hollow unitary cooling box extending transversely of said wall across more than one-half the width of the furnace, the central portion of said tion, substantia 1y as described.

box lying above'the nose end of the gas port and forming the only connection between the end portions of the'box, said box being insertible and removable from the side; of the furnace, and forming means to pro vide for the presence of a relatively large unitary body of cooling liquid within that portionof the furnace which the box occu- .pies substantially as described.

2. The combination with a furnace having gas and air ports anda refractorywall separating said ports, of a hollow cooling box extending transversely of said wall and across themajo-r portion of the width of the furnace, said box being insertible and removable from the side of the furnace and its end portions being connected only by a portion thereof which extends over the gas port, and said portion having supporting means for an arch portion of said refractory Wall, substantially as described.

3., The combination with a furnace having gas and air ports and a refractory wall separating said ports, of a hollow cooling box extending transversely of said wall and across the major. portion of the width of the furnace, said box being inclined down-- wardly from one end toward the other, substantially as described.

4. The combination with a furnace havinggas' and air ports and a refractory wall separating said ports, of a hollow cooling box extending transversely of said wall and -across the major portion of the'width of the furnace, said box being insertible and removable from the side of the furnace and its end portions being connected only by a portion thereof which extends over the gas port, and said portion having supporting means for an arch portion of said refractory wall, and the box also having a depending hollow flange abutting and protecting the front edge of said arch, substantially as described.

5. The combination with a furnace having gas and air ports and a refractory wall separating said ports, of a hollow cooling box extending transversely of said wall and across the major portion of the width of the furnace, said box being insertible and removable from the side of the furnace and its end portions being-connected only by a portion thereof which extends over the gas port, and said portion having supporting means for an arch portion of said refractory wall, together with water supply pipes extending into said box from each end thereof and dischargin adjacent to its central 6. The combination with a furnace having gas and air ports and a refractory wall 'wall across more than one-half the width of the furnace, the central portion of said box por- lying above the nose end of the gas port neoting circulating pipes thereto for said 10 and forming the only connection between liquid; substantially as described. the end portions of the box, said box being In testimony whereof, I have hereunto set irfiseitible andriemovable from the side (of my hand. 5 t e urnace, an formin means to rovi e for the presence of a rela%ively large iinitary LUTHER KNOX body of cooling liquid within that portion Witnesses: of the furnace which the box occupies, and R. A. BALDERSOIN, the ends of the box having means for con- H. M. Conwm. 

